I would like Jennifer's opinion here. I haven't seen a response from her in the thread, and I think she has the best chance of judging this right.
Otherwise, I think what we have is a conundrum because Juno is fictional. Her lines are script, and I think that makes her sound more N than she really would be. Her articulation is not something I took for granted in the movie--I kept on thinking, "nobody would say that." I may grant the fact that her words themselves are N-ish, but everything else is ISFP. She may simply be an inconsistent, unrealistic character with traits that stick out of both Ne and Fi-Se.